Wet-chemical
fabrication of a crystalline Ag-TCNQ (TCNQ = 7,7,8,8-tetracyanoquinodimethane)
thin film on non-Ag substrate is challenging whereby the chemistry
was powered by photon energy and/or electrical energy. We report for
the first time, direct chemical growth of a Ag-TCNQ thin film on a
functionalized Au substrate by employing the layer-by-layer (LbL)
approach at ambient reaction conditions. Various Ag(I) salt precursors
previously realized to be unsuitable for the fabrication of Ag-TCNQ
thin films on non-Ag substrates ultimately gave rise to dense and
uniform thin films of Ag-TCNQ. The crucial knob regulating the direct
formation of the thin films of Ag-TCNQ was identified to be the pH
of the respective Ag(I) solutions.
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